PS. I have no idea why it formats so weirdly here so pasting it to pastebin also - http://pastebin.com/Ee0S3GD0OK Solved NOW. Most stupid error ever - a typo in key name: /etc/pve/priv/ceph/shred.keyring instead of shared.keyring. Sorry!

haha. Never mind, I found it in the Ceph Server documentation. For the record, I'll copy it here for anyone else:

You also need to copy the keyring to a predefined location.Note that the file name needs to be storage id + .keyring . storage id is the expression after 'rbd:' in /etc/pve/storage.cfg which is my-ceph-storage in the current example.
# cd /etc/pve/priv/
# mkdir ceph
# cp /etc/ceph/ceph.client.admin.keyring ceph/my-ceph-storage.keyring

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